IF so happens that you feel you are not yet ready for the 4.0 update. No data is lost during this whole process.
The theme update 4.0 has no major changes, so you can work on 4.0 theme with 3.9 plugins, fully stable version.
Please follow these steps :
1. Click on the button revert to 3.x in the admin notices. https://prnt.sc/tk0anj
if revert notice is not appearing then simply goto wp-admin -> lms -> settings -> functions -> ad hoc and follow :
2. Deactivate wplms_plugin and vibebp
3. Activate plugins , Vibe course modules, Vibe Customtypes, Vibe shortcodes, WPLMS Assignments, WPLMS Dashboards, WPLMS Front End.
4. You may need to setup widgets in the dashboard area that is WP admin – Appearance – Widgets – Student and Instructor sidebar.
Now you are back on 3.x framework.
IF you want last stable versions of old plugins. Download here :